evdev: Factor common code out of key & touch converters

ui/events/ozone/evdev/event_converter.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ui/events/ozone/evdev/event_converter.h"
+
+#include <errno.h>
+#include <linux/input.h>
+
+#include "ui/events/ozone/evdev/event_modifiers.h"
+
+namespace ui {
+
+// Number of events to read at a time.
+const int kEvdevBufferSize = 64;
+
+EventConverterEvdev::EventConverterEvdev(int fd,
+                                         base::FilePath path,
+                                         EventModifiersEvdev* modifiers)
+    : fd_(fd), path_(path), modifiers_(modifiers) {}
+
+EventConverterEvdev::~EventConverterEvdev() { close(fd_); }
+
+void EventConverterEvdev::OnFileCanReadWithoutBlocking(int fd) {
+  input_event inputs[kEvdevBufferSize];
+  ssize_t read_size = read(fd, inputs, sizeof(inputs));
+  if (read_size <= 0) {
+    if (errno == EINTR || errno == EAGAIN)
+      return;
+    PLOG(ERROR) << "error reading device " << path_.value();
+    return;
+  }
+
+  CHECK_EQ(read_size % sizeof(*inputs), 0u);
+  ProcessEvents(inputs, read_size / sizeof(*inputs));
+}
+
+void EventConverterEvdev::OnFileCanWriteWithoutBlocking(int fd) {
+  NOTREACHED();
+}
+
+}  // namespace ui